Boosters (Uncharted 3: Drake's Deception)

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The booster system has changed slightly from the booster system in Uncharted 2: Among Thieves. This time around, the effect of boosters will change with which rank the booster is at. The more a booster is used, the more it will rank up. The higher its rank, the greater its reward. For every booster there are three levels that can be unlocked through earning the corresponding medals that go along with it.